More RuboCop fixes

Author: eregon

core/objectspace/weakmap/element_reference_spec.rb

@@ -3,7 +3,7 @@
 describe "ObjectSpace::WeakMap#[]" do
   it "is faithful to the map's content" do
     map = ObjectSpace::WeakMap.new
-    key1, key2 = %w[a b].map &:upcase
+    key1, key2 = %w[a b].map(&:upcase)
     ref1, ref2 = %w[x y]
     map[key1] = ref1
     map[key1].should == ref1
@@ -16,7 +16,7 @@
 
   it "matches using identity semantics" do
     map = ObjectSpace::WeakMap.new
-    key1, key2 = %w[a a].map &:upcase
+    key1, key2 = %w[a a].map(&:upcase)
     ref = "x"
     map[key1] = ref
     map[key2].should == nil

core/objectspace/weakmap/element_set_spec.rb

@@ -9,7 +9,7 @@ def should_accept(map, key, value)
 
   it "is correct" do
     map = ObjectSpace::WeakMap.new
-    key1, key2 = %w[a b].map &:upcase
+    key1, key2 = %w[a b].map(&:upcase)
     ref1, ref2 = %w[x y]
     should_accept(map, key1, ref1)
     should_accept(map, key1, ref1)

core/objectspace/weakmap/shared/include.rb

@@ -14,7 +14,7 @@
 
   it "matches using identity semantics" do
     map = ObjectSpace::WeakMap.new
-    key1, key2 = %w[a a].map &:upcase
+    key1, key2 = %w[a a].map(&:upcase)
     ref = "x"
     map[key1] = ref
     map.send(@method, key2).should == false